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DC offset in NI USB 7856R

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Hi all,

 

I have developed a labview project to acquire data continuously from my FPGA device (NI USB 7856R) and later plot it in excel. After a series of debugging attempts, I am still left with one. I am applying a test signal: sine wave (through signal generator device) of 100Khz 1Vpp at input and expect the same at output. However I do not get a perfect sine wave but it experiences a certain DC offset. (Please find the attached waveform) I tested my signal generator itself and it works fine.

Also I face another issue. When I apply absolutely no input, the waveform plots a straight line of -10.5 V. I don't understand the reason behind it.

Please find the attached project and respective VIs. Any help is appreciated.

Thank You !

 

P.S: Please refer to attached VIs only. I apologize for the excess VIs and messy organisation.

 

Regards

Pratik


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